US7416744B2 - Extracts, compounds and pharmaceutical compositions having anti-diabetic activity and their use - Google Patents
Extracts, compounds and pharmaceutical compositions having anti-diabetic activity and their use Download PDFInfo
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- US7416744B2 US7416744B2 US11/248,614 US24861405A US7416744B2 US 7416744 B2 US7416744 B2 US 7416744B2 US 24861405 A US24861405 A US 24861405A US 7416744 B2 US7416744 B2 US 7416744B2
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- diabetic
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- glucose
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Classifications
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K45/00—Medicinal preparations containing active ingredients not provided for in groups A61K31/00 - A61K41/00
- A61K45/06—Mixtures of active ingredients without chemical characterisation, e.g. antiphlogistics and cardiaca
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/56—Compounds containing cyclopenta[a]hydrophenanthrene ring systems; Derivatives thereof, e.g. steroids
- A61K31/57—Compounds containing cyclopenta[a]hydrophenanthrene ring systems; Derivatives thereof, e.g. steroids substituted in position 17 beta by a chain of two carbon atoms, e.g. pregnane or progesterone
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/56—Compounds containing cyclopenta[a]hydrophenanthrene ring systems; Derivatives thereof, e.g. steroids
- A61K31/58—Compounds containing cyclopenta[a]hydrophenanthrene ring systems; Derivatives thereof, e.g. steroids containing heterocyclic rings, e.g. danazol, stanozolol, pancuronium or digitogenin
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/74—Synthetic polymeric materials
- A61K31/765—Polymers containing oxygen
- A61K31/78—Polymers containing oxygen of acrylic acid or derivatives thereof
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K36/00—Medicinal preparations of undetermined constitution containing material from algae, lichens, fungi or plants, or derivatives thereof, e.g. traditional herbal medicines
- A61K36/18—Magnoliophyta (angiosperms)
- A61K36/185—Magnoliopsida (dicotyledons)
- A61K36/27—Asclepiadaceae (Milkweed family), e.g. hoya
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P3/00—Drugs for disorders of the metabolism
- A61P3/08—Drugs for disorders of the metabolism for glucose homeostasis
- A61P3/10—Drugs for disorders of the metabolism for glucose homeostasis for hyperglycaemia, e.g. antidiabetics
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
- A61P31/10—Antimycotics
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- Pharmacology & Pharmacy (AREA)
- Medicinal Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Chemical & Material Sciences (AREA)
- Epidemiology (AREA)
- Natural Medicines & Medicinal Plants (AREA)
- Engineering & Computer Science (AREA)
- Diabetes (AREA)
- General Chemical & Material Sciences (AREA)
- Botany (AREA)
- Mycology (AREA)
- Microbiology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medical Informatics (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Organic Chemistry (AREA)
- Biotechnology (AREA)
- Alternative & Traditional Medicine (AREA)
- Hematology (AREA)
- Communicable Diseases (AREA)
- Bioinformatics & Cheminformatics (AREA)
- Endocrinology (AREA)
- Obesity (AREA)
- Oncology (AREA)
- Emergency Medicine (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Medicines Containing Plant Substances (AREA)
- Coloring Foods And Improving Nutritive Qualities (AREA)
- Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
- Non-Alcoholic Beverages (AREA)
- Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
- Steroid Compounds (AREA)
- Medicines Containing Material From Animals Or Micro-Organisms (AREA)
Abstract
The invention relates inter alia to pharmaceutical compositions containing an extract obtainable from a plant of the genus Trichocaulon or Hoodia having anti-diabetic activity; and to the use of such extracts and to compound (1) as herein defined and its analogues for the manufacture of medicaments having anti-diabetic activity.
Description
This is a divisional application of U.S. application Ser. No. 09/891,615 (filed Jun. 27, 2001) now U.S. Pat. No. 7,033,616, allowed, which claims the benefit of U.K. Patent Application No. 0016213.1 (filed Jun. 30, 2000), all of which are herein incorporated by reference in their entirety.
This application claims benefit of priority 35 U.S.C 119 to U.K. Application No. 0016213.1 filed Jun. 30, 2000 and is incorporated herein in its entirety by reference.
THIS INVENTION relates to a new use for steroidal glycosides and compositions containing them for use in the prevention and treatment of diabetes.
In a particular application, the invention relates to an anti-diabetic agent, to an anti-diabetic composition containing the anti-diabetic agent, and to a method for treating diabetes.
The International application WO 98/46243 discloses steroidal glycosides having appetite suppressant activity. In particular, it describes extracts from the genus Trichocaulon or of the genus Hoodia and having appetite suppressant activity; these extracts include the compound of general formula (1):
In accordance with S.I. nomenclature, the active principle (1) is the compound 3-0-[-β-D-thevetopyranosyl-(1-4)-β-D-cymaropyranosyl-(1-4)-β-D-cymaropyranosyl]-12β-0-tigloyloxy-14-hydroxy-14β-pregn-50-en-20-one (C47H74O15 M+878).
Also, WO 98/46243 discloses further active analogues or steroidal glycosides derivatives of general formula (2), (3), (4), (5), (6), (7), (8), (9), (10), (11), (12), (13), (14) (see herein below) having appetite suppressant activity.
Diabetes is a deficiency condition marked by a habitual discharge of an excessive quantity of urine; in particular, it includes diabetes mellitus, which is a metabolic disorder in which the ability to oxidize carbohydrates is more or less completely lost, usually due to faulty pancreatic activity, especially of the islets of Langerhans, and consequent disturbance of normal insulin mechanism. This produces hyperglycemia with resulting glycosuria and polyuria giving symptoms of thirst, hunger, emaciation and weakness and also imperfect combustion of fats with resulting acidosis, sometimes leading to dyspnea, lipemia, ketonuria, and finally coma; there may also be pruritus and lowered resistance to pyogenic infections (Dorland's Medical Dictionary—24th Edition—W.B.Saunders Company).
The diabetic disease state is characterized by an impaired glucose metabolism that manifests itself in, inter alia, elevated glucose levels in patients suffering therefrom. Generally, diabetes is classified into two distinct subgroups:
(1) Type 1 diabetes, or insulin-dependent diabetes mellitus (IDDM), which arises when patients lack β-cells producing insulin in their pancreatic glands, and
(2) Type 2 diabetes, or non-insulin dependent diabetes mellitus (NIDDM), which occurs in patients with, inter alia, impaired β-cell function.
At present, Type 1 diabetic patients are treated with insulin, while the majority of Type 2 diabetic patients are treated with hypoglycemic agents, such as sulfonylureas that stimulate β-cell function, with other agents that enhance the tissue selectivity of the patients towards insulin, or with insulin itself. Unfortunately, the use of insulin currently requires multiple daily doses, normally administered by self-injection, with determination of the proper dosage of insulin requiring frequent estimations of the sugar in urine or blood, performed either by the patient or the administering physician. The unintended administration of an excess dose of insulin can result in hypoglycemia, with adverse effects ranging from mild abnormalities in blood glucose to coma, or even death. Although hypoglycemic agents such as sulfonylureas have been employed widely in the treatment of NIDDM, this treatment is, in many instances, not completely satisfactory. Where existing treatments prove ineffective in normalizing blood sugar levels of patients, there is an increased risk of acquiring diabetic complications. Also, many patients gradually lose the ability to respond to treatment with sulfonylureas and are thus gradually forced into insulin treatment. Since many extant forms of diabetic therapy have proven ineffective achieving satisfactory glycemic control, there continues to be a great demand for novel therapeutic approaches.
According to the invention, it has been found that the extracts from a plant of the genus Trichocaulon or of the genus Hoodia, the compound of general formula (1), as well as the steroidal glycosides derivatives of general formula (2), (3), (4), (5), (6), (7), (8), (9), (10), (11), (12), (13), (14) (see herein below) have anti-diabetic activity.
The present invention is particularly concerned with the treatment of Type II diabetes and the corresponding anti-diabetic agents. The invention provides a new use for steroidal glycosides and compositions containing them for use in the prevention and treatment of diabetes. The invention provides an anti-diabetic agent, an anti-diabetic composition containing the anti-diabetic agent, a foodstuff or beverage containing the anti-diabetic agent, kits based on the anti-diabetic agent, a method for preventing or treating diabetes or impaired glucose tolerance, and a method of decreasing blood glucose level. The anti-diabetic agent may be an extract from a plant of the genus Trichocaulon or of the genus Hoodia, a compound of general formula (1), as well as the steroidal glycosides derivatives of general formula (2), (3), (4), (5), (6), (7), (8), (9), (10), (11), (12), (13), or (14), each as described herein below.
Definitions
“Acyl” means an H—CO— or Alkyl-CO— group wherein the alkyl group is as herein described. Preferred acyls contain a lower alkyl. Exemplary acyl groups include formyl, acetyl, propanoyl, 2-methylpropanoyl, butanoyl and palmitoyl.
“Alkyl” means an aliphatic hydrocarbon group which may be straight or branched having about 1 to about 20 carbon atoms in the chain. Preferred alkyl groups have 1 to about 12 carbon atoms in the chain. Branched means that one or more lower alkyl groups such as methyl, ethyl or propyl are attached to a linear alkyl chain. “Lower alkyl” means about 1 to about 4 carbon atoms in the chain which may be straight or branched. Exemplary alkyl groups include methyl, ethyl, n-propyl, i-propyl, n-butyl, t-butyl, n-pentyl, 3-pentyl.
“Aryl” means an aromatic monocyclic or multicyclic ring system of about 6 to about 14 carbon atoms, preferably of about 6 to about 10 carbon atoms. The aryl is optionally substituted with one or more ring system substituents which may be the same or different, and are as defined herein. Exemplary aryl groups include phenyl or naphthyl, or phenyl substituted or naphthyl substituted.
The term “pharmaceutical composition” means a composition comprising a compound of general formula (1), (2), (3), (4), (5), (6), (7), (8), (9), (10), (11), (12), (13), (14), or an extract in accordance with this invention, and at least one component selected from the group comprising pharmaceutically acceptable carriers, diluents, adjuvants, excipients, or vehicles, such as preserving agents, fillers, disintegrating agents, wetting agents, emulsifying agents, suspending agents, sweetening agents, flavoring agents, perfuming agents, antibacterial agents, antifungal agents, lubricating agents and dispensing agents, depending on the nature of the mode of administration and dosage forms.
“Pharmaceutically acceptable” means it is, within the scope of sound medical judgement, suitable for use in contact with the cells of humans and animals without undue toxicity, irritation, allergic response and the like, and are commensurate with a reasonable benefit/risk ratio.
“Pharmaceutically acceptable dosage forms” means dosage forms of the compound of the invention, and includes, for example, tablets, dragees, powders, elixirs, syrups, liquid preparations, including suspensions, sprays, inhalants tablets, lozenges, emulsions, solutions, granules, capsules and suppositories, as well as liquid preparations for injections, including liposome preparations. Techniques and formulations generally may be found in Remington, Pharmaceutical Sciences, Mack Publishing Co., Easton, Pa., latest edition.
“Pharmaceutically acceptable prodrugs” as used herein means those prodrugs of the compounds useful according to the present invention which are, within the scope of sound medical judgment, suitable for use in contact with the tissues of humans and animals with undue toxicity, irritation, allergic response, and the like, commensurate with a reasonable benefit/risk ratio, and effective for their intended use, as well as the zwitterionic forms, where possible, of the compounds of the invention. The term “prodrug” means compounds that are rapidly transformed in vivo to yield the parent compound of the above formula, for example by hydrolysis in blood. Functional groups which may be rapidly transformed, by metabolic cleavage, in vivo form a class of groups reactive with the carboxyl group of the compounds of this invention. Because of the ease with which the metabolically cleavable groups of the compounds useful according to this invention are cleaved in vivo, the compounds bearing such groups act as pro-drugs. A thorough discussion of prodrugs is provided in the following: Design of Prodrugs, H. Bundgaard, ed., Elsevier, 1985; Methods in Enzymology, K. Widder et al, Ed., Academic Press, 42, p. 309-396, 1985; A Textbook of Drug Design and Development, Krogsgaard-Larsen and H. Bundgaard, ed., Chapter 5; Design and Applications of Prodrugs p. 113-191, 1991; Advanced Drug Delivery Reviews, H. Bundgard, 8, p. 1-38, 1992; Journal of Pharmaceutical Sciences, 77, p. 285, 1988; Chem. Pharm. Bull., N. Nakeya et al, 32, p. 692, 1984; Pro-drugs as Novel Delivery Systems, T. Higuchi and V. Stella, Vol. 14 of the A.C.S. Symposium Series, and Bioreversible Carriers in Drug Design, Edward B. Roche, ed., American Pharmaceutical Association and Pergamon Press, 1987, which are incorporated herein by reference.
“Pharmaceutically acceptable salts” means the relatively non-toxic, inorganic and organic acid addition salts, and base addition salts, of compounds of the present invention. These salts can be prepared in situ during the final isolation and purification of the compounds. In particular, acid addition salts can be prepared by separately reacting the purified compound in its free base form with a suitable organic or inorganic acid and isolating the salt thus formed. See, for example S. M. Berge, et al., Pharmaceutical Salts, J. Pharm. Sci., 66: p. 1-19 (1977) which is incorporated herein by reference. Base addition salts can also be prepared by separately reacting the purified compound in its acid form with a suitable organic or inorganic base and isolating the salt thus formed. Base addition salts include pharmaceutically acceptable metal and amine salts.
The term “animal” as used herein extends to, but is not restricted to, companion animals, e.g. household pets and domesticated animals; non-limiting examples of such animals include cattle, sheep, ferrets, swine, camels, horses, poultry, fish, rabbits, goats, dogs and cats.
According to the present invention, and as hereinbefore and hereafter mentioned:
-
- “diabetes” preferably refers to non-insulin dependent diabetes (type II);
- “anti-diabetic” means the activity useful for the “treatment” of “diabetes”,
which includes the prevention of the development of diabetes, and/or the treatment of established diabetes; it also includes the prevention of the causes of diabetes, and/or the decrease or disappearance of its symptoms and/or consequences.
In particular, it has been found that compounds of the invention have at least the following double therapeutic effect:
- 1) the prevention of diabetes, since the compounds of the invention can treat impaired glucose tolerance;
- 2) the actual treatment of established diabetes since the compounds of the invention can decrease the blood glucose level.
According to a first embodiment, the invention concerns the use of an extract from a plant of the genus Trichocaulon or Hoodia, as described in WO 98/46243 (the contents of which are incorporated herein by reference thereto) in the manufacture of a medicament having anti-diabetic activity.
Preferably, the said extract comprises as an active ingredient a compound of general formula (1):
According to a further aspect, the invention also concerns the said extract for use as a medicament having anti-diabetic activity.
The invention also extends to a pharmaceutical composition having anti-diabetic activity comprising an effective quantity of the said extract; and to compounds of formula (1) having anti-diabetic activity.
It is also provided a method for treating diabetes by administering to a human or animal an effective dosage of the said extract or the said composition.
According to a still further aspect, the invention also concerns the use of the said extract in the manufacture of a foodstuff or beverage to have an anti-diabetic effect when ingested.
The said foodstuff or beverage comprising an effective quantity of the said extract to have an anti-diabetic effect when ingested is also part of the present invention.
According to a further embodiment, the invention concerns the use of one or more steroidal glycosides derivatives of general formula (A) (see below) and their pharmaceutically acceptable salts and pro-drugs in the manufacture of a medicament having anti-diabetic activity:
In the general formula (A):
- R=alkyl;
- R1=H, alkyl, tigloyl, anthraniloyl, or any other organic ester group;
- R2=H, or one or more 6-deoxy carbohydrates, or one or more 2,6-dideoxy carbohydrates, or glucose molecules, or combinations thereof;
- R3=H, alkyl, aryl, acyl, or glucoxy,
- R4, R5=either R4, R5 form together with the Carbon atom which they are attached to a carbonyl group (—C═O), or R4=H and R5=H, OH;
- R6, R7=either R6, R7 form together with the Carbon atom C-16 which they are attached to a carbonyl group (—C═O), or R6=H and R7=—OR3;
- R8=H, OH; and
- the broken lines indicate the optional presence of a further bond between C4-C5 or C5-C6, and/or C14-C15.
Preferably, compounds of general formula (A) can be chosen from the following families of formula (2), (3), (4), (5), (6), (7), (8), (9), (10), (11), (12), (13) or (14) below, as described in WO 98/46243 and incorporated herein by reference:
In the general formula (2), (3), (4), (5), (6), (7), (8), (9), (10), (11), (12), (13) above:
- R, R1, R2, R3 are as defined above;
- and in the general formula (14): R=H, alkyl, aryl or any steroid possessing a C14 beta hydroxy group, or a C12 beta hydroxy functionality, or a C17 acyl group, or a C5-C6 olefin, or combinations thereof, as described in WO 98/46243.
According to a still more preferred aspect, compounds of general formula (A) are represented by formula (1):
According to a preferred embodiment, the invention concerns the use of the compound of general formula (1) (see herein above) as described in WO 98/46243 and incorporated herein by reference in the manufacture of a medicament having anti-diabetic activity.
According to a further aspect, the invention also concerns the said compounds of general formula (A), including that of formula (1) (see herein above) for use as a medicament having anti-diabetic activity.
The invention also extends to a pharmaceutical composition having anti-diabetic activity comprising an effective quantity of one or more of the said compounds of general formula (A), preferably that of formula (1) (see herein above). It is also provided a method for treating diabetes by administering to a human or animal an effective dosage of one or more of the said derivatives of general formula (A), preferably that of formula (1) (see herein above) or the said compositions.
According to a still further aspect, the invention also concerns the use of one or more of the said derivatives of general formula (A), preferably that of formula (1), (see herein above) in the manufacture of a foodstuff or beverage to have an anti-diabetic effect when ingested.
The said foodstuff or beverage comprising an effective quantity of one or more of the said derivatives of general formula (A), preferably that of formula (1) (see herein above) to have an anti-diabetic effect when ingested, is also part of the present invention.
As described in WO 98/46243 and incorporated herein by reference, the active ingredient may be an extract from a plant of the genus Trichocaulon or Hoodia, or a compound of the formula (1) (either extracted from a plant of the genus Trichocaulon or Hoodia or prepared synthetically) or a derivative thereof.
The plant may be of the species Trichocaulon officinale or Trichocaulon piliferum, or the species Hoodia currorii, Hoodia gordonii or Hoodia lugardii.
Preferably, the compounds of the invention are prepared in pharmaceutically acceptable dosage forms. The anti-diabetic composition or formulation may consist of the anti-diabetic agent admixed with a pharmaceutical excipient, diluent or carrier. Other suitable additives, including a stabilizer and such other ingredients as may be desired may be added.
The composition may be prepared in unit dosage form.
As an anti-diabetic agent, a compound of formula (A), preferably of formula (1), or the composition as herein above mentioned, is advantageously administered to said human in a dosage amount of from about 0.05 mg/kg/day to about 100 mg/kg/day. A preferred dosage range is about 0.1 mg/kg/day to about 50 mg/kg/day. When using the spray dried powder form of the extract of this invention, a preferred dosage range is about 0.5 mg/kg/day to about 100 mg/kg/day; especially preferred is about 1 mg/kg/day to about 50 mg/kg/day.
According to a further aspect, the invention also concerns a pharmaceutical composition comprising an effective amount of:
- i) an extract as mentioned above or a compound of formula (A), (1), (2), (3), (4), (5), (6), (7), (8), (9), (10), (11), (12), (13) or (14) as described above, in association with
- ii) one or more other agents chosen from: representative agents to treat diabetes, glycogen phosphorylase inhibitors, sorbitol dehydrogenase inhibitors, glucosidase inhibitors, aldose reductase inhibitors;
Representative agents that can be used to treat diabetes include insulin and insulin analogs: (e.g., LysPro insulin, inhaled formulations comprising insulin); GLP-1 (7-37) (insulinotropin) and GLP-1 (7-36)-NH2; sulfonylureas and analogs: chlorpropamide, glibenclamide, tolbutamide, tolazamide, acetohexamide, glypizide, glimepiride, repaglinide, meglitinide; biguanides: metformin, phenformin, buformin; a2-antagonists and imidazolines: midaglizole, isaglidole, deriglidole, idazoxan, efaroxan, fluparoxan; other insulin secretagogues: linogliride, insulinotropin, exendin-4, BTS-67582, A-4166; glitazones: ciglitazone, pioglitazone, englitazone, troglitazone, darglitazone, rosiglitazone; PPAR-gamma agonists; RXR agonists: JTT-501, MCC-555, MX-6054, DRF2593,GI-262570, KRP-297, LG100268; fatty acid oxidation inhibitors: clomoxir, etomoxir; α-glucosidase inhibitors: precose, acarbose, miglitol, emiglitate, voglibose, MDL-25,637, camiglibose, MDL-73,945; β-agonists: BRL 35135, BRL 37344, Ro 16-8714, ICI D7114, CL 316,243, TAK-667, AZ40140; phosphodiesterase inhibitors, both cAMP and cGMP type: sildenafil, L686398: L-386,398; lipid-lowering agents: benfluorex, atorvastatin; antiobesity agents: fenfluramine, orlistat, sibutramine; vanadate and vanadium complexes (e.g., Naglivan®) and peroxovanadium complexes; amylin antagonists: pramlintide, AC-137; lipoxygenase inhibitors: masoprocal; somatostatin analogs: BM-23014, seglitide, octreotide; glucagon antagonists: BAY 276-9955; insulin signaling agonists, insulin mimetics, PTP1B inhibitors: L-783281, TER17411, TER17529; gluconeogenesis inhibitors: GP3034; somatostatin analogs and antagonists; antilipolytic agents: nicotinic acid, acipimox, WAG 994; glucose transport stimulating agents: BM-130795; glycogen phosphorylase inhibitors: glucose synthase kinase inhibitors: lithium chloride, CT98014, CT98023; galanin receptor agonists; MTP inhibitors such as those disclosed in U.S. provisional patent application No. 60/164,803; growth hormone secretagogues such as those disclosed in PCT publication numbers WO 97/24369 and WO 98/58947; NPY antagonists: PD-160170, BW-383, BW1229, CGP-71683A, NGD 95-1, L-152804; anorectic agents inlcuding 5-HT and 5-HT2C receptor antagonists and/or mimetics: dexfenfluramine, Prozac®, Zoloft®; CCK receptor agonists: SR-27897B; galanin receptor antagonists; MCR-4 antagonists: HP-228; leptin or mimetics: leptin; 11-beta-hydroxysteroid dehydrogenase type-I inhibitors; urocortin mimetics, CRF antagonists, and CRF binding proteins: RU-486, urocortin. Other anti-diabetic agents that can be used include ergoset and D-chiroinositol. Other anti-diabetic agents will be known to those skilled in the art.
Any glycogen phosphorylase inhibitor may be used as the second compound of this invention. The term glycogen phosphorylase inhibitor refers to any substance or agent or any combination of substances and/or agents which reduces, retards, or eliminates the enzymatic action of glycogen phosphorylase. The currently known enzymatic action of glycogen phosphorylase is the degradation of glycogen by catalysis of the reversible reaction of a glycogen macromolecule and inorganic phosphate to glucose-1-phosphate and a glycogen macromolecule which is one glucosyl residue shorter than the original glycogen macromolecule (forward direction of glycogenolysis). Such actions are readily determined by those skilled in the art according to standard assays (e.g., as described hereinafter). A variety of these compounds are included in the following published PCT patent applications: PCT application publication WO 96/39384 and WO96/39385. However, other glycogen phosphorylase inhibitors will be known to those skilled in the art.
Any sorbitol dehydrogenase inhibitor may be used as the second compound of the invention. Sorbitol dehydrogenase inhibitors lower fructose levels and have been used to treat or prevent diabetic complications such as neuropathy, retinopathy, nephropathy, cardiomyopathy, microangiopathy, and macroangiopathy. U.S. Pat. Nos. 5,728,704 and 5,866,578 disclose compounds and a method for treating or preventing diabetic complications by inhibiting the enzyme sorbitol dehydrogenase.
A glucosidase inhibitor inhibits the enzymatic hydrolysis of complex carbohydrates by glycoside hydrolases, for example amylase or maltase, into bioavailable simple sugars, for example, glucose. The rapid metabolic action of glucosidases, particularly following the intake of high levels of carbohydrates, results in a state of alimentary hyperglycemia which, in adipose or diabetic subjects, leads to enhanced secretion of insulin, increased fat synthesis and a reduction in fat degradation. Following such hyperglycemias, hypoglycemia frequently occurs, due to the augmented levels of insulin present. Additionally, it is known that both hypoglycemias and chyme remaining in the stomach promotes the production of gastric juice, which initiates or favors the development of gastritis or duodenal ulcers. Accordingly, glucosidase inhibitors are known to have utility in accelerating the passage of carbohydrates through the stomach and inhibiting the absorption of glucose from the intestine. Furthermore, the conversion of carbohydrates into lipids of the fatty tissue and the subsequent incorporation of alimentary fat into fatty tissue deposits is accordingly reduced or delayed, with the concomitant benefit of reducing or preventing the deleterious abnormalities resulting therefrom.
Any glucosidase inhibitor may be employed in combination with the extracts of this invention and with the compounds of Formula (A), the stereoisomers and prodrugs thereof, and the pharmaceutically acceptable salts of the compounds, stereoisomers, and prodrugs; however, generally preferred glucosidase inhibitors comprise amylase inhibitors. An amylase inhibitor is a glucosidase inhibitor that inhibits the enzymatic degradation of starch or glycogen into maltose. The inhibition of such enzymatic degradation is beneficial in reducing amounts of bioavailable sugars, including glucose and maltose, and the concomitant deleterious conditions resulting therefrom.
A variety of glucosidase inhibitors will be known to one of ordinary skill in the art. However, in the practice of the pharmaceutical compositions, combinations, methods, and kits of the instant invention, generally preferred glucosidase inhibitors are those inhibitors selected from the group consisting of acarbose, adiposine, voglibose, miglitol, emiglitate, MDL-25637, camiglibose, tendamistate, AI-3688, trestatin, pradimicin-Q and salbostatin.
The glucosidase inhibitor acarbose, O-4,6-dideoxy-4-[[(1S,4R,5S,6S)-4,5,6-trihydroxy-3-(hydroxymethyl)-2-cyclohexen-1-yl]amino]-α-glucopyranosyl-(1 - - - >4)-O-α-D-glucopyranosyl-(1 - - - >4)-D-glucose, the various amino sugar derivatives related thereto and a process for the preparation thereof by the microbial cultivation of Actinoplanes strains SE 50 (CBS 961.70), SB 18 (CBS 957.70), SE 82 (CBS 615.71), SE 50/13 (614.71) and SE 50/110 (674.73) are disclosed in U.S. Pat. Nos. 4,062,950 and 4,174,439 respectively.
The glucosidase inhibitor adiposine, consisting of adiposine forms 1 and 2, is disclosed in U.S. Pat. No. 4,254,256. Additionally, a process for the preparation and purification of adiposine is disclosed in Namiki et al., J. Antiobiotics, 35, 1234-1236 (1982). The glucosidase inhibitor voglibose, 3,4-dideoxy-4-[[2-hydroxy-1-(hydroxymethyl)ethyl]amino]-2-C-(hydroxymethyl)-D-epi-inositol, and the various N-substituted pseudo-aminosugars related thereto, are disclosed in U.S. Pat. No. 4,701,559.
The glucosidase inhibitor miglitol, (2R,3R,4R,5S)-1-(2-hydroxyethyl)-2-(hydroxymethyl)-3,4,5-piperidinetriol, and the various 3,4,5-trihydroxypiperidines related thereto, are disclosed in U.S. Pat. No. 4,639,436.
The glucosidase inhibitor emiglitate, ethyl p-[2-[(2R,3R,4R,5S)-3,4,5-trihydroxy-2-(hydroxymethyl)piperidino]ethoxy]-benzoate, the various derivatives related thereto and pharmaceutically acceptable acid addition salts thereof, are disclosed in U.S. Pat. No. 5,192,772.
The glucosidase inhibitor MDL-25637, 2,6-dideoxy-7-O-β-D-glucopyrano-syl-2,6-imino-D-glycero-L-gluco-heptitol, the various homodisaccharides related thereto and the pharmaceutically acceptable acid addition salts thereof, are disclosed in U.S. Pat. No. 4,634,765.
The glucosidase inhibitor camiglibose, methyl 6-deoxy-6-[(2R,3R,4R,5S)-3,4,5-trihydroxy-2-(hydroxymethyl)piperidino]-β-D-glucopyranoside sesquihydrate, the deoxy-nojirimycin derivatives related thereto, the various pharmaceutically acceptable salts thereof and synthetic methods for the preparation thereof, are disclosed in U.S. Pat. Nos. 5,157,116 and 5,504,078.
The glucosidase inhibitor pradimicin-Q and a process for the preparation thereof by the microbial cultivation of Actinomadura verrucospora strains R103-3 or A10102, are disclosed in U.S. Pat. Nos. 5,091,418 and 5,217,877 respectively.
The glycosidase inhibitor salbostatin, the various pseudosaccharides related thereto, the various pharmaceutically acceptable salts thereof and a process for the preparation thereof by the microbial cultivation of Streptomyces albus strain ATCC 21838, are disclosed in U.S. Pat. No. 5,091,524.
Any aldose reductase inhibitor may be used in the pharmaceutical compositions, methods and kits of this invention. The term aldose reductase inhibitor refers to a compound which inhibits the bioconversion of glucose to sorbitol catalyzed by the enzyme aldose reductase. Such inhibition is readily determined by those skilled in the art according to standard assays (J. Malone, Diabetes, 29:861-864, 1980. “Red Cell Sorbitol, an Indicator of Diabetic Control”). The following patents and patent applications, each of which is hereby wholly incorporated herein by reference, exemplify aldose reductase inhibitors which can be used in the compositions, methods and kits of this invention, and refer to methods of preparing those aldose reductase inhibitors: U.S. Pat. No. 4,251,528; U.S. Pat. No. 4,600,724; U.S. Pat. 4,464,382, U.S. Pat. No. 4,791,126, U.S. Pat. No. 4,831,045; U.S. Pat. No. 4,734,419; U.S. Pat. No. 4,883,800; U.S. Pat. No. 4,883,410; U.S. Pat. No. 4,883,410; U.S. Pat. No. 4,771,050; U.S. 5,252,572; U.S. Pat. No. 5,270,342; U.S. Pat. No. 5,430,060; U.S. Pat. No. 4,130,714; U.S. Pat. No. 4,540,704; U.S. Pat. No. 4,438,272; U.S. Pat. No. 4,436,745, U.S. Pat. No. 4,438,272; U.S. Pat. No. 4,436,745, U.S. Pat. No. 4,438,272; U.S. Pat. No. 4,436,745, U.S. Pat. No. 4,438,272; U.S. Pat. No. 4,980,357; U.S. Pat. No. 5,066,659; U.S. Pat. No. 5,447,946; U.S. Pat. No. 5,037,831.
A variety of aldose reductase inhibitors are specifically described and referenced below, however, other aldose reductase inhibitors will be known to those skilled in the art. Also, common chemical USAN names or other designations are in parentheses where applicable, together with reference to appropriate patent literature disclosing the compound.
Accordingly, examples of aldose reductase inhibitors useful in the compositions, methods and kits of this invention include:
1. 3-(4-bromo-2-fluorobenzyl)-3,4-dihydro-4-oxo-1-phthalazineacetic acid (ponalrestat, U.S. Pat. No. 4,251,528);
2. N[[(5-trifluoromethyl)-6-methoxy-1-naphthalenyl]thioxomethyl}-N-methylglycine (tolrestat, U.S. Pat. No. 4,600,724);
3. 5-[(Z,E)-βP-methylcinnamylidene]-4-oxo-2-thioxo-3-thiazolideneacetic acid (epalrestat, U.S. Pat. No. 4,464,382, U.S. Pat. No. 4,791,126, U.S. Pat. No. 4,831,045);
4. 3-(4-bromo-2-fluorobenzyl)-7-chloro-3,4-dihydro-2,4-dioxo-1(2H)-quinazolineacetic acid (zenarestat, U.S. Pat. No. 4,734,419, and U.S. Pat. No. 4,883,800);
5. 2R,4R-6,7-dichloro-4-hydroxy-2-methylchroman-4-acetic acid (U.S. Pat. No. 4,883,410);
6. 2R,4R-6,7-dichloro-6-fluoro-4-hydroxy-2-methylchroman-4-acetic acid (U.S. Pat. No. 4,883,410);
7. 3,4-dihydro-2,8-diisopropyl-3-oxo-2H-1,4-benzoxazine-4-acetic acid (U.S. Pat. No. 4,771,050);
8. 3,4-dihydro-3-oxo-4-[(4,5,7-trifluoro-2-benzothiazolyl)methyl]-2H-1,4-benzothiazine-2-acetic acid (SPR-210, U.S. Pat. No. 5,252,572);
9. N-[3,5-dimethyl-4-[(nitromethyl)sulfonyl]phenyl]-2-methyl-benzeneacetamide (ZD5522, U.S. Pat. No. 5,270,342 and U.S. Pat. No. 5,430,060);
10. (S)-6-fluorospiro[chroman-4,4′-imidazolidine]-2,5¢-dione (sorbinil, U.S. Pat. No. 4,130,714);
11. d-2-methyl-6-fluoro-spiro(chroman-4′,4′-imidazolidine)-2′,5′-dione (U.S. Pat. No. 4,540,704);
12. 2-fluoro-spiro(9H-fluorene-9,4′-imidazolidine)-2′,5′-dione (U.S. Pat. No. 4,438,272);
13. 2,7-di-fluoro-spiro(9H-fluorene-9,4′-imidazolidine)-2′,5′-dione (U.S. Pat. No. 4,436,745, U.S. Pat. No. 4,438,272);
14. 2,7-di-fluoro-5-methoxy-spiro(9H-fluorene-9,4′-imidazolidine)-2′,5′-dione (U.S. Pat. No. 4,436,745, U.S. Pat. No. 4,438,272);
15. 7-fluoro-spiro(5H-indenol[1,2-b]pyridine-5,3′-pyrrolidine)-2,5′-dione (U.S. Pat. No. 4,436,745, U.S. Pat. No. 4,438,272);
16. d-cis-6′-chloro-2′,3′-dihydro-2′-methyl-spiro-(imidazolidine-4,4′-4′H-pyrano(2,3-b)pyridine)-2,5-dione (U.S. Pat. No. 4,980,357);
17. spiro[imidazolidine-4,5′ (6H)-quinoline]-2,5-dione-3′-chloro-7′, 8′-dihydro-7′-methyl-(5′-cis) (U.S. Pat. No. 5,066,659);
18. (2S,4S)-6-fluoro-2′,5′-dioxospiro(chroman-4,4′-imidazolidine)-2-carboxamide (fidarestat, U.S. Pat. No. 5,447,946); and
19. 2-[(4-bromo-2-fluorophenyl)methyl]-6-fluorospiro[isoquinoline-4(1H),3′-pyrrolidine]-1,2′,3,5′ (2H)-tetrone (minalrestat, U.S. Pat. No. 5,037,831).
Other aldose reductase inhibitors include compounds of formula (B):
Z in the compound of formula B is O or S;
R1 in the compound of formula B is hydroxy or a group capable of being removed in vivo to produce a compound of formula B wherein R1 is OH; and
X and Y in the compound of formula B are the same or different and are selected from hydrogen, trifluoromethyl, fluoro, and chloro.
A preferred subgroup within the above group of aldose reductase inhibitors includes numbered compounds 1, 2, 3, 4, 5, 6, 9, 10, and 17, and the following compounds of formula B:
20. 3,4-dihydro-3-(5-fluorobenzothiazol-2-ylmethyl)-4-oxophthalazin-1-yl-acetic acid [R1=hydroxy; X=F; Y=H];
21. 3-(5,7-difluorobenzothiazol-2-ylmethyl)-3,4-dihydro-4-oxophthalazin 1-ylacetic acid [R1=hydroxy; X=Y=F];
22. 3-(5-chlorobenzothiazol-2-ylmethyl)-3,4-dihydro-4-oxophthalazin-1-ylacetic acid [R1=hydroxy; X=Cl; Y=H];
23. 3-(5,7-dichlorobenzothiazol-2-ylmethyl)-3,4-dihydro-4-oxophthalazin-1-ylacetic acid [R1=hydroxy; X═Y═Cl];
24. 3,4-dihydro-4-oxo-3-(5-trifluoromethylbenzoxazol-2-ylmethyl)phthalazin-1-ylacetic acid [R1=hydroxy; X═CF3; Y═H];
25. 3,4-dihydro-3-(5-fluorobenzoxazol-2-ylmethyl)-4-oxophthalazin-1-yl-acetic acid [R1=hydroxy; X═F; Y═H];
26. 3-(5,7-difluorobenzoxazol-2-ylmethyl)-3,4-dihydro-4-oxophthalazin-1-ylacetic acid [R1=hydroxy; X═Y═F];
27. 3-(5-chlorobenzoxazol-2-ylmethyl)-3,4-dihydro-4-oxophthalazin-1-ylacetic acid [R1=hydroxy; X═Cl; Y═H];
28. 3-(5,7-dichlorobenzoxazol-2-ylmethyl)-3,4-dihydro-4-oxophthalazin-1-ylacetic acid [R1=hydroxy; X═Y═Cl]; and
29. zopolrestat; 1-phthalazineacetic acid, 3,4-dihydro-4-oxo-3-[[5-(trifluoromethyl)-2-benzothiazolyl]methyl]-[R1=hydroxy; X=trifluoromethyl; Y=H].
In compounds 20-23 and 29, Z is S. In compounds 24-28, Z is O.
Of the above aldose reductase inhibitors, compound 4 (zenarestat) is especially preferred.
Said compounds of formula B are prepared as disclosed in U.S. Pat. No. 4,939,140.
The aldose reductase inhibitor compounds of this invention are readily available or can be easily synthesized by those skilled in the art using conventional methods of organic synthesis, particularly in view of the pertinent patent specifications.
The invention also extends to:
-
- the use of the said association of the ingredients i) and ii) as mentioned above in the manufacture of a medicament having anti-diabetic activity;
- the method of treating or preventing diabetes which comprises administering to a human or animal an effective dosage of the said association; and
- kits or single packages combining the active ingredients (i) and (ii) as mentioned above, useful in treating or preventing diabetes.
The ingredients i) and ii) of the association can be administered simultaneously, separately, or sequentially in any order.
Preferably, the invention extends to a method of lowering or maintaining the glucose blood level by administering to a human or animal an effective dosage of an extract, or a compound as described above, or a composition containing the same.
Preferably, the invention extends to a method of lowering or maintaining the glucose blood level by ingesting a foodstuff or beverage containing an extract, or a compound as described above.
More preferably, the invention also extends to the treatment of impaired glucose tolerance.
Still more preferably, the invention provides a protective effect, in that the glucose blood level may not substantially increase after the arrest of the administration of an extract, compound, composition and/or foodstuff or beverage described above.
A method has been described in WO 98/46243 for extracting steroidal glycosides from plant material obtained from a plant of the Trichocaulon or Hoodia genus.
The extract having anti-diabetic activity according to the invention may be prepared in accordance with the process described in WO 98/46243 for preparing an extract of a plant of the genus Trichocaulon or of the genus Hoodia, the extract comprising an appetite suppressant agent.
As described in WO 98/46243 and incorporated herein by reference, the process for preparing an extract of a plant of the genus Trichocaulon or of the genus Hoodia comprising a anti-diabetic agent includes the steps of treating collected plant material with a solvent to extract a fraction having anti-diabetic activity, separating the extraction solution from the rest of the plant material, removing the solvent from the extraction solution and recovering the extract. The extract so recovered may be further purified, e.g. by way of suitable solvent extraction procedures.
The extract may be prepared from plant material such as the stems and roots of said plants of the genus Trichocaulon or of the genus Hoodia. The genus Trichocaulon and the genus Hoodia include succulent plants growing in arid regions such as are found in Southern Africa. In one application of the invention, the anti-diabetic extract is obtained from the species Trichocaulon piliferum. The species Trichocaulon officinale may also be used to provide an active anti-diabetic extract. In another application of the invention, the active anti-diabetic extract may be obtained from the species Hoodia curroril, Hoodia gordonii or Hoodia lugardii.
The plant material may be homogenised in the presence of a suitable solvent, for example, a methanol/methylene chloride solvent, by means of a device such as a Waring blender. The extraction solution may then be separated from the residual plant material by an appropriate separation procedure such as, for example, filtration or centrifugation. The solvent may be removed by means of a rotary evaporator, preferably in a water bath at a temperature of 60° C. The separated crude extract may then be further extracted with methylene chloride and water before being separated into a methylene chloride extract and a water extract. The methylene chloride extract may have the solvent removed preferably by means of evaporation on a rotary evaporator and the resultant extract may be further purified by way of a methanol/hexane extraction. The methanol/hexane extraction product may then be separated to yield a methanol extract and a hexane extract. The methanol extract may be evaporated to remove the solvent in order to yield a partially purified active extract.
The partially purified active extract may be dissolved in methanol, and may be further fractionated by column chromatography, employing silica gel as an adsorption medium and a chloroform/30% methanol mixture as an eluent. A plurality of different fractions may be obtained, and each may be evaluated, by suitable bioassaying procedures, to determine the anti-diabetic activity thereof.
A fraction having anti-diabetic activity may preferably be further fractionated such as by column chromatography using silica gel as an adsorption medium and a 9:1 chloroform:methanol solvent, and the resultant sub-fractions bioassayed for their anti-diabetic activity. A sub-fraction displaying anti-diabetic activity may, if desired, be further fractionated and purified, conveniently using a column chromatographic procedure with silica gel as the adsorption medium and a 9:1 ethylacetate:hexane solvent. The resultant purified fractions may again be evaluated by suitable bioassay procedures for their anti-diabetic activity.
The Applicant has found that at least one such purified fraction has good anti-diabetic activity, and the active principle in the fraction was identified by conventional chemical techniques including nuclear magnetic resonance, and was found to be a compound of the structural formula (1) as shown above.
According to another aspect of the invention, there is provided a process for preparing an extract of a plant of the genus Trichocaulon or of the genus Hoodia, the extract comprising an anti-diabetic agent, the process including the steps of pressing collected plant material to separate sap from solid plant material and recovering the sap free of the solid plant material to form the extract.
The extract may be dried to remove moisture, e.g. by spray-drying, freeze-drying or vacuum drying, to form a free-flowing powder.
The steroidal glycosides derivatives of general formula (A) as described above having anti-diabetic activity according to the invention may be prepared as described in WO 98/46243.
The molecules chosen as the analogues or derivatives are intended to affect the properties of the steroidal trisaccharide with the aim of increasing the activity of the active ingredient. The following effects were taken into consideration when the analogues were chosen:
(i) Hydrophobic Interactions and Lipophilicity
-
- Functional group modifications of the active molecule is intended to change the hydrophobicity and lipophilicity of the molecule. Increased lipophilicity has been shown to correlate with increased biological activity, poorer aqueous solubility, increased detergency/cell lysis, increased storage in tissues, more rapid metabolism and elimination, increased plasma protein binding and faster rate of onset of action.
(ii) Electronic Properties and Ionization Constants - Functional group modification of the molecule is also intended to change the acidity and basicity which would have a major role in controlling the transport of the compound to its site of action and the binding at this target site.
(iii) Hydrogen Bonding - Functional group modifications of carboxyl and carbonyl groups in the active molecule are intended to change the interactions between the proteins in biological systems and the chemically modified functional groups.
(iv) Steric Parameters - The purpose of changing the steric features of the molecule is to increase binding to its receptor and thus increase its biological activity.
- Functional group modifications of the active molecule is intended to change the hydrophobicity and lipophilicity of the molecule. Increased lipophilicity has been shown to correlate with increased biological activity, poorer aqueous solubility, increased detergency/cell lysis, increased storage in tissues, more rapid metabolism and elimination, increased plasma protein binding and faster rate of onset of action.
The following are examples of the analogues and derivatives in accordance with this invention:
- a) Chemical modification of the C-12 group and ester functionality;
- b) Chemical modification of the 5,6-double bond, e.g. hydrogenation and migration;
- c) Chemical modification of the C-20 carbonyl and C-17 acetyl group;
- d) Chemical modification of the “D” ring of the steroid or aglycone ring;
- e) Modification of the carbohydrates of the trisaccharide moiety.
Accordingly, the invention provides the compounds of general formula (A), (1), (2), (3), (4), (5), (6), (7), (8), (9), (10), (11), (12), (13), (14) as shown above, wherein in the general formula (A), (2), (3), (4), (5), (6), (7), (8), (9), (10), (11), (12), (13):
-
- R=alkyl;
- R1=H, alkyl, tigloyl, benzoyl, or any other organic ester group;
- R2=H, or one or more 6-deoxy carbohydrates, or one or more 2,6-dideoxy carbohydrates, or glucose molecules, or combinations thereof;
- and the broken lines indicate the optional presence of a further bond between C4-C5 or C5-C6, and/or C14-C15;
- R3=H, alkyl, aryl, acyl, or glucoxy.
And in the general formula (14): - R=H, alkyl, aryl or any steroid possessing a C14 beta hydroxy group, or a C12 beta hydroxy functionality, or a C17 acyl group, or a C5-C6 olefin, or combinations thereof.
The invention still further extends to a process for synthetically producing a compound having anti-diabetic activity, such as those of general formula (A), (1), (2), (3), (4), (5), (6), (7), (8), (9), (10), (11), (12), (13), (14).
The process for preparing the compounds of general formula (1), (2), (3), (4), (5), (6), (7), (8), (9), (10), (11), (12), (13), (14), their intermediates and process for preparing them are described in WO 98/46243 and are incorporated herein by reference. Compounds of formula (A) can be prepared by analogy or adaptation of this process.
The invention and its efficacy is further described, without limitation of the scope of the invention, with reference to the examples 1-41 and the drawings of the application WO 98/46243 and incorporated herein by reference, together with the following examples and drawings.
In the drawings, FIG. 1 shows a flow diagram of the general method of extracting a first crude anti-diabetic extract and a purified anti-diabetic extract from plant material of the genus Trichocaulon or Hoodia;
FIGS. 2 and 3 together show a schematic representation of a preferred embodiment of the process of the invention for producing an extract of plant material of the genus Trichocaulon or Hoodia.
The effects of compounds of this invention on the glucose and insulin status were assessed as follows:
Animals and Husbandry
The animals used for this study were 30 male ZDF rats and 6 male lean ZDF rats obtained from Gmi (Indianapolis, Ind., USA). The rats arrived at 6 weeks of age. The acute study was undertaken when the rats were 7 weeks old and the chronic study started when the rats were 9 weeks old.
Animals were housed under the following conditions:
Temperature: | 23° C. ± 1° C. | ||
Light: | 12 hours light/12 hours dark, | ||
lights on at 7 AM | |||
Animals were housed in plastic cages with bedding. Animals were fed a standard laboratory diet (rat and mouse breeding diet, (Beekay Feed, B & K Universal Ltd, Hull, UK)) and drinking water was provided ad libitum.
Experimental Design
Acute Study
This was a single dose, dose-response study in ZDF rats. The 30 ZDF rats were allocated to one of 5 groups so that there were 6 rats in each group. In addition there were 6 untreated lean ZDF rats. All of the rats were housed individually. The acute dose of the compound as given by oral gavage at 9.30 AM. Control ZDF and lean rats received water. Food intake was measured over the periods 9.30-16.00 (daytime) and 16.00-9.30 (night-time) for 48 hours.
Chronic Study
After a wash-out of 9 days after the acute dose, the rats were retained in the same treatment groups for the chronic study. For this study, there were two treatment groups and each treatment group had a pair-fed control group. For the pair-feeding, rats were individually matched. Pair-fed rats together with controls were dosed with water daily. Rats were dosed daily at ca 9.30 AM. The initial doses were 120 mg/kg (high dose) and 60 mg/kg (low dose).
Food and water intake were measured daily. Bodyweights were measured twice weekly. Blood samples were taken for determination of glucose, insulin and leptin. Oral glucose tolerance was also measured.
Acclimatisation
Six days prior to the single dose administration the rats were allocated to individual cages and were provided with food and water ad libitum. Four days prior to dose administration, 50 g of food was placed in each cage. Then two days prior to dose administration at ca 9.30 and 16.00 hours the food remaining was weighed and replaced with a further 50 g.
Group Allocation
Groups were assigned as follows:
Acute Study |
Group | Cage | Treatment | Dose level |
A | 1-6 | Water | 1 | ml/kg |
B | 6-12 | The compound (1) | 20 | mg/kg |
C | 13-18 | The compound (1) | 40 | mg/kg |
D | 19-24 | The compound (1) | 80 | mg/kg |
E | 25-30 | The compound (1) | 160 | mg/kg |
F | 31-36 | No treatment (lean litter mates) | N/A |
N/A = Not applicable |
Chronic Study |
Group | Cage | Treatment | Dose level |
A | 1-6 | Water | 1 | ml/kg |
B | 6-12 | The compound (1) | 120 | mg/kg |
C | 13-18 | Water (pair fed group B) | 1 | ml/kg |
D | 19-24 | The compound (1) | 60 | mg/kg |
E | 25-30 | Water (pair fed group D) | 1 | ml/kg |
F | 31-36 | No treatment (lean litter mates) | N/A |
N/A = Not applicable |
Groups C and D were pair fed, they received the exact amount of food (plus 1 g for waste) eaten by the respective pair rats from the treated groups in the previous 24 hours.
Test Compound Administration
Acute Study—The compound (1) was made up in water. Animals were administered with a single oral dose of The compound (1) at the appropriate rate. Control animals received water alone at the rate of 1 ml/kg. The compound (1) was administered at ca 9.30 AM.
Chronic Study—The compound (1) was made up in water. Animals were dosed at the appropriate rate daily by oral gavage. Control animals received water alone at the rate of 1 ml/kg. Doses were administered at ca 10 AM each day for a total of 30 days.
On Day 7 of the dosing procedure the dose levels of groups B & D were reduced to 60 mg/kg and 30 mg/kg due to concerns over that food intake suppression might be too great. The dosing procedure remained the same and animals were dosed for a further 23 days (30 days dosing in total).
Experimental Procedures
Measurement of Food and Water Intake
Daily food and water intake of each rat was measured by weight. Any spilled food was also collected and weighed so that an accurate estimate of food consumption could be made.
Measurement of Bodyweight
The bodyweight of each rat was measured twice weekly throughout the course of the study.
Blood Sampling
For measurement of blood glucose levels, a 20 μl sample of blood was taken from the tail vein whilst animals were in a fed state. A further 100 μl sample of blood was taken and the plasma separated by centrifugation (5000 rpm, 5 minutes). Plasma samples were then analysed for insulin and leptin using rat insulin or leptin ELISA kits (Crystal Chem Inc, PO Box 60225, Chicago, Ill. 60660, USA). Blood glucose, insulin and leptin levels were determined at approximately weekly intervals.
Fasted glucose, insulin and leptin levels were determined in an identical manner but animals were fasted for 5 hours prior to samples being taken.
Oral Glucose Tolerance Test (OGTT)
Oral glucose tolerance was measured at 9 days following treatment (chronic study). Animals were fasted for 5 hours prior to the start of the OGTT. Animals were treated with glucose diluted in water at a rate of 2 g/kg (1 mg/ml). Blood samples were taken at 0, 30, 60 90 and 120 minutes. Glucose concentrations were determined by mixing blood samples with 0.38 ml of haemolysis reagent. A duplicate 20 μl aliquots of this mixture was taken for each individual sample and placed in an assay tray. To each well was added 180 μl aliquots of Trinders glucose reagent. The samples were mixed and then left for approximately 30 minutes. Samples were then analysed automatically using a SpectraMax 250 and SoftMax Pro software (Molecular devices Corporation, 1311 Orleans Drive, Sunnyvale, Calif. 94089, USA). The results were converted into glucose concentration values using Prism software, version 3.0 (GraphPad Software Inc, San Diego, Calif. USA)
The OGTT was repeated after 30 days treatment. The procedure was identical except that the pair-fed rats were each given 6 g of food at 7 AM with food being withdrawn at 9 AM for 5 hours.
Blood samples for insulin were obtained at 30 minutes prior to and 60 minutes post glucose load.
Regression Study
In order to determine the potential long-term effects of The compound (1), the measurement of food and water intake were continued following withdrawal of treatment.
Termination of Experiment
The experiment was terminated 36 days after the end of compound administration in the chronic study.
Statistical Analysis and Data Compilation
The significance of any differences between control animals and animals treated with The compound (1) was determined using ANOVA tests.
Results
The values reported in this section are mean values for each group of animals. Data for individual animals in are shown in the appendices.
Acute Study
Effect of The compound (1) on Food Intake
The compound (1), over the dose range 20-160 mg/kg, had no significant effect on daytime food intake over the 7 hour period post-dosing. However, it produced a dose-related reduction in the night-time food intake such that the food intake such that the food intake of ZDF rats given the 160 mg/kg dose level was the same as the lean rats.
Food intake for the period 24-48 hours past a simple oral dose was also reduced (both daytime and night-time) in a dose-related manner.
Significant reduction in food intake was only demonstrated in the first 24 hours in rats given The compound (1) (160 mg/kg) but in the second day both the effects of the 80 and 160 mg/kg doses were significant.
Chronic Study
Effect of the Compound (1) on Food Intake
Daytime and night-time food intake were determined separately. Daytime intake in untreated ad-lib fed rats was approximately 25% of the night-time intake. ZDF rats ate more than the lean control rats during both day and night-time.
Treatment with The compound (1) at 120 mg/kg and 60 mg/kg produced an increasing effect on daytime intake over the first 7 days. However the full effect on night-time intake was apparent after 2 days.
As the reduction in food intake after 7 days was around 50% with both dose levels, it was decided to reduce the dosing levels to 60 mg/kg and 30 mg/kg respectively. Treatment continued for a further 21 days.
Over the period 7-14 days, there was a small reduction in the effectiveness of The compound (1) on food intake reduction but the rate of change in efficacy after reducing the dose level was slow. After 14 days food intake in both groups stabilised.
After withdrawal of the drug treatment after 28 days, food intake was monitored for a further 17 days. Surprisingly there was only a small loss of efficacy relative to the control ZDF rats.
The pattern of feeding in the pair-fed rats was not significantly different from treated animals showing the successful adoption of the pair-feeding regime.
Effect of the Compound (1) on Water Intake
The ZDF rats were 9 weeks old at the start of the chronic study and their water intake relative to lean controls indicates that they were diabetic. Thus their intake was around 80 ml/rat/day as against 25 ml/rat/day for lean controls. [One control ZDF rat remained non-diabetic throughout the course of the study and all data from this rat was eliminated from the results].
Treatment with the Compound (1) at either the high dose (120 or 60 mg/kg/day) or the low dose (60 or 30 mg/kg/day) reduced water intake within 4 days to the level in the lean controls and was maintained at this level throughout the dosing period. Water intake in the pair-fed groups was also reduced in an identical manner to the treated groups.
After withdrawal of the treatment after 30 days water intake of both previously treated and pair-fed controls rose slightly but even after 66 days the rats were not as diabetic as the untreated controls.
The water intake in the untreated controls rose steadily from the initial 80 ml/rat/day at the beginning of the study (rats were then 9 weeks old) to around 200 ml/rat/day after a further 4 weeks.
Effect of the Compound (1) on Bodyweight
At the start of the chronic study the bodyweight of the ZDF rats was approximately 280 g whereas the lean littermates were approximately 220 g.
The bodyweight of the untreated lean littermates increased steadily throughout the course of the study to approximately 380 g at the end of the experiment. This contrasted with the control ZDF rats whose bodyweight plateaued after 3 weeks (at the age 12 weeks) at between 360-370 g. This plateau in growth rate is presumably due to the severe diabetes. Treatment with The compound (1) produced a dose-related decrease in the growth rate over the first 3 weeks of treatment relative to ZDF controls but whereas the growth rate of the ZDF controls plateaued, the growth of rats given The compound (1) continued and plateaued at a much higher level (more than 400 g). The growth rate of the pair-fed rats mirrored the effect of their corresponding treated groups. There was actual actual gain of bodyweight for the ZDF rat over the treatment period.
Effect of the Compound (1) on Glucose Concentration in Fed Rats
Treatment with The compound (1) and pair feeding to the intake of ZDF rats given The compound (1) resulted in a reduction in the blood glucose concentration from the diabetic level to a similar concentration as in lean littermates after 7 days of treatment.
Normal glycaemia was maintained until withdrawal of therapy when blood glucose concentration steadily increased in a similar manner in both rats previously given The compound (1) and their pair-fed controls.
Effect of the Compound (1) on Blood Glucose Concentration in Fasted Rats
Animals were fasted for 5 hours prior to taking a blood sample. Both after 8 days treatment and 29 days treatment, the blood glucose concentration of rats given The compound (1) and their pair-fed controls did not differ significantly from the concentration in lean rats and was significantly lower than that in ZDF controls.
Effect of the Compound (1) on Oral Glucose Tolerance
Oral glucose tolerance was determined after 8 days and after 29 days of treatment, i.e. on day 9 and day 30. Rats were fasted for 5 hours prior to receiving an oral 2 g/kg glucose load.
The fasting blood glucose in the ZDF control rats on day 9 was around 11 mM and after the oral glucose load, rose to a mean of more than 14 mM. In contrast, rats given The compound (1) and their pair-fed controls had fasting blood glucose concentrations similar to the lean rats and glucose tolerance was only marginally impaired relative to lean. Similar results were obtained in the study conducted on day 29 except that the fasting blood glucose of the ZDF rats was higher, indicative of their advancing diabetic state.
Discussion
The inbred (>F30 generations) Zucker diabetic male fatty rat is a recently developed model of non-insulin dependent diabetes. It is on the Zucker background and the fa gene. The original obesity trait in Zucker rats was identified by Zucker and Zucker and has since been maintained in numerous locations around the world. The original non-inbred rat model is associated with massive obesity, hyperinsulinaemia and glucose intolerance but not frank diabetes.
In contrast, the inbred ZDF/Gmi, which had its origin in a non-inbred colony in which some obese rats developed overt diabetes (1), demonstrates a characteristic and consistent diabetes (2, 3). Hyperglycaemia is initially manifest at about 7 weeks of age and all obese males are fully diabetic by 10 weeks with fed blood glucose concentrations of about 30 mM. Between 7 and 10 weeks, blood insulin concentrations fall as the pancreatic β-cells cease to respond to the glucose stimulus (4-9). The loss of response to glucose appears to be associated with the disappearance of GLUT-2 transporters on the β-cells in the islets. There is also a reduced number of GLUC-4 transporters in skeletal muscle (10-12). Thus the ZDF rat shows both an impairment of insulin action, i.e. insulin resistance and an insulin secretory defect and is recognised as a good model of non-insulin dependent diabetes. The first-line treatment for non-insulin dependent diabetes in man is diet plus exercise. Whilst the original dietary concept was a reduction in intake of carbohydrate, today it is focussed on a weight reducing diet that is low in fat, contains significant carbohydrate as polysaccharides but is low in mono and disaccharides. It should also be high in fibre. If body weight can be reduced by 5 kg then a marked improvement in diabetic control can be achieved. In practice relatively few diabetics (more than 90% of non-insulin dependent diabetic patients are overweight) are able to achieve and maintain such weight loss. Thus, there is a clear indication for therapeutic agents that will produce a reduction in obesity for the treatment of non-insulin dependent diabetes. Indeed, FDA guidelines for anti-obesity drugs specifically recognise treatment of diabetes as a secondary end-point. The compound (1) has previously been shown to reduce food intake in normal rats when administered orally. However, no previous studies have been undertaken in obese animals, which might respond differently. Furthermore, energy intake and expenditure are often closely linked and it was possible that The compound (1) might exert independent effects on intake and expenditure. Thus, as a control for possible effects unrelated to food intake, pair-fed controls were included in the current study. A further potential of the present study was to examine the possible development of pharmacological tolerance.
One previous study (13) in pre-diabetic ZDF rats has demonstrated that if 6 week old ZDF rats were diet-matched with lean littermates for 12 weeks, they remained euglycaemic. Since the rats at 6 weeks of age are pre-diabetic, then this merely demonstrates that dietary restriction will prevent the development of diabetes in this model. The present study is the first to examine the treatment of established diabetes. In order to establish dose levels for the chronic study, a single dose, dose-response study was undertaken to examine the effect on food intake. Surprisingly the effect of The compound (1) appeared to be slow in onset with little apparent effect over the first few hours. However, since the dose was administered at 09.30 and daytime food intake is only approximately 20% of the 24 h intake, it is not absolutely clear that there is a time-delay in the response, but it appears likely. Further studies in which the dose is administered just before the dark-phase are needed to clarify this point.
The duration of response to a single dose was long without effects still being seen during the second day after a single dose. As a result of the single dose study doses of 120 and 60 mg/kg/day were selected for the chronic study.
The chronic administration of these dose levels produced a somewhat greater effect on food intake than was expected, possibly because of slow elimination of The compound (1). To avoid possible adverse effects of severe calorie restriction, the dose-levels were reduced after 7 days to 60 and 30 mg/kg respectively.
The compound (1) produced a marked reduction in food intake, which was sustained with no indication of tolerance. This reduction in food intake was reflected in lower initial growth rates. However, after 14 days, rats given The compound (1) had a higher growth rate than the control ZDF rats. This was because the ZDF controls had reached a plateau weight, presumably as a result of their severe diabetes. By the end of the treatment period the ZDF rats given the low dose of The compound (1) were actually heavier than the controls whilst the high dose The compound (1) rats were the same weight.
Withdrawal of the drug surprisingly did not lead to a rebound hyperphagia. Whether this indicates a long wash-out period for The compound (1) or it is a reflection of the difference in the diabetic status of the control ZDF rats and rats given The compound (1) is not known.
In parallel with the changes in food intake, there were substantial improvements in glycaemic status. This was reflected in direct measurements of plasma glucose and glucose tolerance as well as water intake. Since the ZDF control rats exhibit glycosuria they are profoundly polydipsic. Reduction in glycosuria results in substantial reduction in water intake. Thus the daily water intake gives an indirect measure of the level of diabetic control. It is clear that dietary restriction of ZDF rats whether direct or through the use of The compound (1) results in substantial improvement in glycaemic control.
Withdrawal of the treatment did not result in an immediate return to the diabetic state. In fact, it was approximately 2 weeks before the blood glucose concentration and water intake of rats previously given The compound (1) approached that of the diabetic controls. By which time the body weight of the previously treated rats was significantly greater than that of the ZDF controls.
The Gmi ZDF rats retain the fa/fa gene which result in point mutation in the extracellular domain in the leptin receptor conferring insensitivity to leptin. Thus the ZDF rats are obese but the obesity is curtailed by the diabetic condition. The obesity via its action on insulin sensitivity contributes to the diabetic status but the major defect in these rats that results in diabetes is pancreatic. This defect must be unrelated to the fa/fa mutation. It is clear from the above studies that The compound (1) acts on food intake independently of leptin.
Conclusion
The compound (1) is a powerful appetite suppressant in ZDF male rats and is an effective treatment in treating established diabetes.
- 1. Clark, J. B., Palmer, C. J. & Shaw, W. N. (1983). The diabetic Zucker fatty rat. Proc. Soc. Exp. Biol. Med., 173, 68-75.
- 2. Peterson, Richard G. (1995). The Zucker Diabetic Fatty (ZDF) rat. In: Shafrir, E. ed. Lessons from Animal Diabetes V. Great Britain, Smith-Gordon, 225-230.
- 3. Peterson, R. G. (1994). Alfa Glucosidase Inhibitors: Lessons from Animal Studies. European Journal of Clinical Investigation, 24(S3), 11-18.
- 4. Johnson, J. H., Ogawa, A., Chen, L., Orci, L., Newgard, C. B., Alam, T. & Unger, R. H. (1990). Underexpression of b cell high KM glucose transporters in non-insulin dependent diabetes. Science, 250, 546-549.
- 5. Lee, Y., Hirose, H., Ohneda, M., Johnson, J. H., McGarry, J. D. & Unger, R. H. (1994). Beta-cell lipotoxicity in the pathogenesis of non-insulin dependent diabetes mellitus of obese rats: impairment in adipocyte-beta-cell relationships. Proc. Natl. Acad. Sci. USA, 91(23), 10878-10882.
- 6. Milburn, J. L. Jr., Ohneda, M., Johnson, J. H. & Unger, R. H. (1993). Beta-cell GLUT-2 loss and non-insulin dependent diabetes mellitus: current status of the hypothesis. (Review) Diabees Metab. Rev., 9(3), 231-236.
- 7. Pieber, T. R., Stein, D. T., Ogawa, A., Alam, T., Ohneda, M., McCorkle, K., Chen, L., McGarry, J. D. & Unger, R. H. (1993). Amylin-insulin relationships in insulin resistance with and without diabetic hyperglcemia. Am. J. Physiol., 265(3 Pt. 1), E446-E453.
- 8. Slieker, L. J., Sundell, K. L., Heath, W. F., Osborn, H. E., Bue, J., Manetta, J. & Sportsman, J. R. (1992). Glucose transporter levels in tissues of spontaneously diabetic Zucker fa/fa rat (ZDF/Drt) and viable yellow mouse (Avy/a). Diabetes, 41, 187-193.
- 9. Sturis, J., Pugh, W. L., Tang, J., Ostrega, D. M., Polonsky, J. S. & Polonsky, K. S. (1994). Alterations in pulsitile insulin secretion in the Zucker diabetic fatty rat. Am. J. Physiol., 267 Endocrinol. Metab., 30, E250-259.
- 10. Dohm, G. L., Friedman, J. E. & Peterson, R. G. (1993). Acarbose treatment of non-insulin dependent diabetic fatty (ZDF/Drt-fa) rats restores expression of skeletal muscle glucose transporter GLUT-4. In: Drugs in Development, Volume 1, a-Glucosidase Inhibition: Potential Use in Diabetes. Vasselli, J. R., Maggio, C. A. & Scirabine, A., eds., Branford, Ct.: Neva Press, 173-180.
- 11. Dolan, P. L., Tapscott, E. B., Peterson, R. G. & Dohm, L. D. Differential effects of acarbose feeding on glucose transport and GLUT-4 protein in lean and obese diabetic ZDF rats. Submitted for publication.
- 12. Friedman, J. E., De Vente, J. E., Peterson, R. G. & Dohm, G. L. (1991). Altered expression of muscle glucose transporter GLUT-4 in diabetic fatty Zucker rats (ZDF/Drt-fa). Am. J. Physiol., 261 (Endocrinol. Metab. 24), E782-788.
- 13. Ohneda, M., Inman, L. R. & Unger, R. H. (1995). Caloric restriction in obese pre-diabetic rats prevents beta-cell depletion, loss of beta-cell GLUT-2 and glucose incompetence. Diabetologia, 38(2), 173-179.
Harvested Hoodia plants received either from the natural environment or through a cultivation programme are first stored at 4° C. for a maximum of 48 hours. The plants are washed in tap water and thereafter sliced into ±1 cm slices. The sliced pieces are all combined and then pressed through a hydraulic press at 300 bar pressure for a minimum of 0.5 hour per pressing. During the pressing the sap of the plant is collected separately. The sap is stored at −18° C. until further processing is required.
The sap is spray-dried under suitable conditions to obtain a free flowing powder. The moisture content in the powder is preferably less than 5% after spray drying and, if necessary, it is further dried in a vacuum oven or using a fluid bed drier.
Both the sap and the spray-dried material have been shown effective as an anti-diabetic in biological assays in rats.
Experimental
50 kg of Hoodia gordonii plants were washed with tap water and thereafter sliced into 1 cm slices. The sliced plants were then pressed through a hydraulic press at 300 bar for a minimum of 0.5 hour per batch. The sap was collected and the mass was found to be 10 kg when Hoodia gordonii plants from the environment were used, and 20 kg when Hoodia gordonii plants from the cultivation programme was used. The sap (500 g) was spray-dried using the following conditions:
Flow rate | 2.85 ml/min | ||
Inlet temperature | 110° C. | ||
Outlet temperature | 70° C. | ||
Chamber temperature | 78° C. | ||
The spray-dried powder obtained was a free flowing powder (22 g) with a moisture content of 6.9%.
The spray dried powder was analysed for active ingredient concentration using HPLC techniques. The concentration of the active was determined to be 13 g/kg of spray dried powder.
HPLC Analysis Method
Eluant | Acetonitrile: water (7:3), isocratic | ||
Column | Reverse phase C-18 | ||
UV absorbance | 225 nm | ||
Flow rate | 1 ml/min | ||
Injection volume | 10 μl | ||
Method
Spray-dried powder (10 mg) was dissolved in water (0.5 ml) and acetonitrile (0.5 ml) 10 μl of this solution was injected into the HPLC and the concentration of the active compound (1) was determined using a standard curve as a reference which had been prepared from the pure compound (1).
It should be understood that the foregoing discussion and examples merely present a detailed description of certain preferred embodiments. It will be apparent to those of ordinary skill in the art that various modifications and equivalents can be made without departing from the spirit and scope of the invention. All the patents, journal articles and other documents discussed or cited above are herein incorporated by reference.
Claims (1)
1. A method of treating Type II diabetes in a human by administering to the human a foodstuff or beverage containing a dried extract of a plant of the genus Hoodia, said extract comprising a compound of formula (1)
wherein said foodstuff or beverage is administered to the human by ingestion and has an anti-diabetic effect when ingested.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/248,614 US7416744B2 (en) | 2000-06-30 | 2005-10-13 | Extracts, compounds and pharmaceutical compositions having anti-diabetic activity and their use |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0016213.1 | 2000-06-30 | ||
GB0016213A GB2363985B (en) | 2000-06-30 | 2000-06-30 | Extracts,compounds & pharmaceutical compositions having anti-diabetic activity and their use |
US09/891,615 US7033616B2 (en) | 2000-06-30 | 2001-06-27 | Extracts, compounds and pharmaceutical compositions having anti-diabetic activity and their use |
US11/248,614 US7416744B2 (en) | 2000-06-30 | 2005-10-13 | Extracts, compounds and pharmaceutical compositions having anti-diabetic activity and their use |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/891,615 Division US7033616B2 (en) | 2000-06-30 | 2001-06-27 | Extracts, compounds and pharmaceutical compositions having anti-diabetic activity and their use |
Publications (2)
Publication Number | Publication Date |
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US20060159779A1 US20060159779A1 (en) | 2006-07-20 |
US7416744B2 true US7416744B2 (en) | 2008-08-26 |
Family
ID=9894853
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/891,615 Expired - Fee Related US7033616B2 (en) | 2000-06-30 | 2001-06-27 | Extracts, compounds and pharmaceutical compositions having anti-diabetic activity and their use |
US11/248,614 Expired - Fee Related US7416744B2 (en) | 2000-06-30 | 2005-10-13 | Extracts, compounds and pharmaceutical compositions having anti-diabetic activity and their use |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/891,615 Expired - Fee Related US7033616B2 (en) | 2000-06-30 | 2001-06-27 | Extracts, compounds and pharmaceutical compositions having anti-diabetic activity and their use |
Country Status (12)
Country | Link |
---|---|
US (2) | US7033616B2 (en) |
EP (1) | EP1166792B1 (en) |
JP (1) | JP2002068994A (en) |
AT (1) | ATE401093T1 (en) |
AU (1) | AU784687B2 (en) |
CA (1) | CA2352005C (en) |
DE (1) | DE60134816D1 (en) |
GB (1) | GB2363985B (en) |
HK (1) | HK1043538A1 (en) |
MX (1) | MXPA01006802A (en) |
NZ (2) | NZ523175A (en) |
ZA (1) | ZA200105278B (en) |
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BRPI0711240A2 (en) * | 2006-06-13 | 2011-08-30 | Unilever Nv | One-shot product and method for appetite suppression |
JP5281234B2 (en) * | 2006-06-27 | 2013-09-04 | ポーラ化成工業株式会社 | Orally administered composition for the improvement and prevention of fatigued eyes due to ciliary overtension |
WO2008019920A1 (en) * | 2006-08-17 | 2008-02-21 | Unilever N.V. | Processes for production of hoodia plant extracts containing steroidal glycosides |
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